Santi Cosma e Damiano was originally a Roman Catholic church affiliated with an Augustinian convent, it is now Greek Orthodox church.
Of the 12th-century Romanesque construction, only the bell-tower remains; the present facade and interiors mainly date to a reconstruction in the 18th century. The main altar (18th century) in polychrome marble has statues by Antonio Callegari and altarpiece by Giambettino Cignaroli and a 16th-century Ark of St Tiziano. Adjacent to the church is a 15th-century cloister. In 1923, at the instigation of a local poet Angelo Canossi, the names of the Italians who died in the war were inscribed in the columns.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.